1. The ice cream should be just lightly softened, not rock hard. If it's too soft, it will start to melt and if it's too hard, it will be difficult to mound evenly on the cookie, and could break the cookie.

2. Spread the sauce on one cookie, and the ice cream on the other. It's difficult to spread the ice cream on a slippery surface.

3. If dipping the sandwich in melted chocolate, it's best to freeze the sandwich until it's very firm before dipping, or the ice cream will start to melt into the chocolate. Use a melted chocolate bar or chocolate chips, something that will harden up. Avoid hot fudge as it will stay sticky.